Assessment of the physical activity level with two questions: validation with doubly labeled water

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To validate a two-question questionnaire on physical activity with the doubly labeled water (DLW) method.


Cross-sectional study.


Nine volunteers, age 33-75 years, with a mean body mass index (BMI) (kg m−2) of 27.4.


A questionnaire with one question on physical activity at work and one question on physical activity during leisure time. The answers were converted into a PAL (physical activity level = energy expenditure/basal metabolic rate) value, which was validated with the DLW method.


The mean values (s.d.) of PAL for the questionnaire and DLW measurements were 1.7 (0.1) and 1.7 (0.1), respectively, with a mean difference of 0.004 (0.172).


The results were promising to the extent that they could be used in large-scale epidemiological studies.

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